Orosur MiningIntercepts High Grade Gold, Including 5.32m at
17.76g/t Au, in Colombia

November 14, 2017 02:00 AM Eastern Time

MONTEVIDEO, Uruguay--(EON: Enhanced Online News)--Orosur Mining Inc. (“Orosur” or “the Company”) (TSX/AIM: OMI), a South
America-focused gold producer, developer and explorer, is pleased to
provide a preliminary update from its current drilling programme at its
APTA target in the Company’s wholly-owned high-grade Anzá gold project
located in the Mid Cauca Gold Belt in Colombia.

“These results are merely the beginning of Orosur’s first drilling
campaign at APTA. APTA mineralization remains open at depth and along
strike.”

HIGHLIGHTS FROM MAP-54

5.47 g/t Au over 4.63m from 97.1m to 101.73m, including 771.3 ppm Cu
and 1.44% Zn

1.68 g/t Au over 1.0m from 126.0m to 127.0m, including 193.2 ppm Cu
and 1.22% Zn

17.76 g/t Au over 5.32m from 144.50m to 149.82m, including 4,724.7ppm
Cu and 4.84 Zn

1.84 g/t Au over 9.28m from 149.82m to 159.1m, including 2,398.0 ppm
Cu and 2.26% Zn

Since mid-October, Orosur has drilled 3 holes (962.5m) of its planned
15,000m diamond drilling programme. Partial sampling, representing just
30% of the samples to be analyzed from the first 2 holes (MAP 54 & MAP
55), was sent to SGS Laboratory in Medellin for assaying. Assay results
include a number of high grade gold intersect intervals as well as
copper, zinc and other notable byproducts as summarized in the table
below:

Hole Number

From (m)

To (m)

Interval (m)

Au g/t

Cu ppm

Zn (%)

MAP‐54

97.10

101.73

4.63

5.47

771.30

1.44

Including

97.10

98.20

1.10

2.59

140.10

0.48

98.20

99.50

1.30

3.67

424.00

0.75

99.5

100.75

1.25

4.41

1,050.10

1.87

100.75

101.73

0.98

12.43

1,584.90

2.90

MAP‐54

126.0

127.0

1.00

1.68

193.20

1.22

MAP‐54

144.5

149.82

5.32

17.76

4,724.70

4.84

including

144.5

145.7

1.20

8.71

778.00

0.80

145.7

146.7

1.00

37.96

575.10

0.70

146.7

148.0

1.30

19.76

324.80

0.25

148.0

148.87

0.87

17.63

4,531.50

7.56

148.87

149.82

0.95

5.31

20,200.00

17.54

MAP‐54

149.82

159.1

9.28

1.84

2,398.00

2.26

including

149.82

150.85

1.03

1.40

17,500

14.26

150.85

151.90

1.05

1.43

39.50

0.045

151.90

153.00

1.10

0.94

246.10

0.88

153.00

154.10

1.10

3.19

2,777.80

1.84

154.10

155.00

0.90

3.73

52.60

0.29

155.00

156.00

1.00

1.79

306.40

0.99

156.00

157.00

1.00

0.97

354.60

1.30

157.00

158.00

1.00

0.92

79.90

0.24

158.00

159.1

1.10

2.34

70.20

0.42

The limited assays returned to date from Hole MAP-55 show interesting
gold anomalies up to 0.26 g/t Au, which matches up with the gold bearing
units identified in the area.

Ignacio Salazar, CEO of Orosur, said:

“These initial results are extremely encouraging, supporting the
presence of high gold mineralization over significant intervals and
increasing confidence in the mineral body beyond the 17,000m of previous
drilling prior to the acquisition of the project by OMI.

“These results are merely the beginning of Orosur’s first drilling
campaign at APTA. APTA mineralization remains open at depth and along
strike.”

Quality Control and Reporting Protocols

This initial drill program recovered HQ core which was logged, split in
half for sampling, with the remainder stored for reference in the secure
core facility at Finca El Vergel, Anzá, Antioquia, Colombia. Samples are
delivered to SGS lab, Medellín, Antioquia, Colombia (ISO/IEC 17025) for
analysis. At the Laboratory, samples are analyzed for gold by
traditional fire assay with atomic absorption finish, with those samples
returning >5 g/t gold repeated using a 30g aliquot and gravimetric
finish. All samples are also analyzed for multi-elements including
silver, lead, copper and zinc by total digestion ICP.

Drill program design, Quality Assurance/Quality Control (“QA/QC”) and
interpretation of results is performed by qualified persons employing a
QA/QC program consistent with NI 43-101 and industry best practices.
Standards, duplicates, and blanks are added at the lab as well as
standards, duplicates, and blanks submitted as unknowns by the Company
every 10 samples.

Assays are reported as composited intervals using weight averages, with
highly enriched zones reported separately. Assays are uncut at this
time. Applicable true widths are determined by ongoing investigation of
the continuity and geometry of zones, and are typically expected to be
65% to 85% of the reported core lengths.

Qualified Person

The technical information related to the current assets of Orosur Mining
in this announcement has been reviewed and approved by independent
Mining engineer Miguel Fuentealba, a qualified person as defined by
National Instrument 43-101.

About Orosur Mining Inc.

Orosur Mining Inc. (TSX: OMI; AIM: OMI) is a fully integrated gold
producer, developer and explorer focused on identifying and advancing
gold projects in South America. The Company operates the only producing
gold mine in Uruguay (San Gregorio), and has assembled an exploration
portfolio of high quality assets in Uruguay, Chile and Colombia.

The information contained within this announcement is deemed by the
Company to constitute inside information as stipulated under the Market
Abuse Regulation ("MAR"). Upon the publication of this announcement via
Regulatory Information Service, this inside information is now
considered to be in the public domain. If you have any queries on this,
then please contact Ignacio Salazar, Chief Executive Officer of the
Company (responsible for arranging release of this announcement) on: +1
(778) 373-0100.

Forward Looking Statements

All statements, other than statements of historical fact, contained or
incorporated by reference in this news release, including any
information as to the future financial or operating performance of the
Company, constitute "forward-looking statements" within the meaning of
certain securities laws, including the "safe harbour" provisions of the
Securities Act (Ontario) and the United States Private Securities
Litigation Reform Act of 1995 and are based on expectations estimates
and projections as of the date of this news release. There can be no
assurance that such statements will prove to be accurate. Such
statements are subject to significant risks and uncertainties, and
actual results and future events could differ materially from those
anticipated in such statements. Forward-looking statements include,
without limitation success of exploration activities; permitting time
lines; the failure of plant; equipment or processes to operate as
anticipated; accidents; labour disputes; requirements for additional
capital title disputes or claims and limitations on insurance coverage.
The Company disclaims any intention or obligation to update or revise
any forward looking statements whether as a result of new information,
future events and such forward-looking statements, except to the extent
required by applicable law.

MONTEVIDEO, Uruguay--(EON: Enhanced Online News)--Orosur Mining Inc. (“Orosur” or the “Company”) (TSX/AIM:OMI), a South American-focused gold producer, developer and explorer announces that at the ... more »